java创建线程的方式

方式一：

创建类继承 Thread，重写 run 方法

public class MyThread extends Thread{

    @Override
    public void run() {
        System.out.println("我是 MyThread 的 run。");
    }
}

public static void main(String[] args) {
    MyThread myThread = new MyThread();
    myThread.start();    
}

方式二：

创建类继承 Runnable，重写 run 方法

public class MyRunnable implements Runnable{
    @Override
    public void run() {
        System.out.println("我是 MyRunnable 的 run。");
    }
}

public static void main(String[] args) {
    MyRunnable myRunnable = new MyRunnable();
    Thread runnable = new Thread(myRunnable);
    runnable.start();
}

方式三：

创建类继承 Callable，重写 call方法

public class MyCallable implements Callable<String> {
    @Override
    public String call() throws Exception {
        System.out.println("我是 MyCallable 的 call。");
        return null;
    }
}

public static void main(String[] args) {
    MyCallable myCallable = new MyCallable();
    FutureTask<String> futureTask = new FutureTask<>(myCallable);
    Thread callable = new Thread(futureTask);
    callable.start();    
}